Alert archive / Illinois / Mesoscale Discussions in 2008

Mesoscale Discussion 108

January 29, 20086 states

The Storm Prediction Center issued this mesoscale discussion at Jan 29, 2008, 3:56 PM CST for 6 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jan 29, 2008, 3:56 PM CST (21:56 UTC)
Expired: Jan 29, 2008, 5:00 PM CST
In force: 64 min
Issued by: the Storm Prediction Center

All 63 counties

Alexander County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Sullivan County, IN, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Scott County, MO, Stoddard County, MO, DeSoto County, MS, Marshall County, MS, Panola County, MS, Tate County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 109 km from the middle of the area, began a volume at 21:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.9 hours before the alert went out and 171 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 19 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 29, 10:21 AM CST	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 8 more	54 min
Jan 29, 10:54 AM CST	Mesoscale Discussion	SPC	Alexander	66 min
Jan 29, 11:32 AM CST	Tornado Watch	SPC	Alexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more	7 hr
Jan 29, 12:19 PM CST	Mesoscale Discussion	SPC	Boone, Carroll, Henderson, Henry, Jo Daviess, Lee and 8 more	4 hr
Jan 29, 1:24 PM CST	Mesoscale Discussion	SPC	Champaign, Christian, Coles, DeWitt, Douglas, Edgar and 11 more	66 min
Jan 29, 4:40 PM CST	Severe Thunderstorm Watch	SPC	Bartholomew, Boone, Brown, Clark, Clay, Clinton and 46 more	3 hr
Jan 29, 5:07 PM CST	Tornado Watch	SPC	Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick	113 min
Jan 29, 5:38 PM CST	Mesoscale Discussion	SPC	Adams, Allen, DeKalb, Huntington, Kosciusko, LaGrange and 6 more	97 min
Jan 29, 7:39 AM CST	Mesoscale Discussion	SPC	Atchison	5 hr

Nearby

Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Tennessee, 2008 Mesoscale Discussions in Kentucky, 2008 Every mesoscale discussion in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.